Starting device for multiphase motors.



H. H. CUTLER. I STARTING DEVICE FOR MULTIPHASE MOTORS.

APPLICATION FILED NOV. 9. I906. RENEWED NOV- 2, 2916- 1,231,714:.Patented July 3, 1917.

m 3% I\ r HA, v fiw-WW Xi a N a w? Q N N m 3 \1 useful Improvements inStartin STATES PATENT OFFICE.

HENRY n. curmm, OLE-MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER-HAMMERMEG. 00., or MILWAUKEE, WISCONSIN, A CORPORATION or WISCONSIN.

STARTING DEVICE FOR MULTIPHASE MOTORS.

Specification 01 Letters meant.

Patented July 3, 1917.

Application natrovw 9,1900, serial No. 341915; Renewed November 2, 1916.Serial n. 129,232.

To all whom'it may concern Be it known that. I, Harm: H. GUTLER, acitizen ofthe Unitedv States, residin at Milwaukee; in the county ofMilwau ee and State of Wisconsin, have invented new and DevicesforMiiltiphase Motors of which t e followingisafu 1, clear, concise,vand exact descrip tion, reference being. had to the accompanyg drawing,forming a part of this. specification) a 1 invention relates toimprovements in "starting devices for, multiphase motors.

Qnetof the. objects of my invention is to provide means ,farremovingresistance from the-motorclrcuit'in sucha manner that-ther'notorwillgradually increase 1nv speed with- 0\lt undue; strain u onthe motor or power circuit. I, have.-.i ustrated in. the accompanyingFigure 1 .a.-diagr-amm-atic view of oneoi the-circuitarrangements -forthe pura pose of disclosing my invention.-

.iIn Fig 2'1 have shown-an end view of H the drumnand. ratchetarrangement here inafter to be described.

In the drawing,.-I have illustrated the rotor 2 of a three-phasealternating current motor providedwith the-three sets of resistanoes3,,4,.and 5. Eachsetofresistance is connected-with arcollectoraringonthe rotor ofithe motor, and isdivided ,into sections.

a connected -.with

v the; contacts. thedrum in a this case serving The sections of each setof resistance are sets 6,7 and 8 of contact rearranged to be engagedfiitsfiofi ontiicts igalth-and ll mounted by ,wire conductors! but inpraoticgl prefer a y constrmkthedrum ofii'on or other. r conductingmaterialand provide --the'-same' 'A,pa1r of sw1tches 36 $1 1 37contifol. the

with pro ections upon which; are; fastened i to. electric-ally'connefithe .contactsj instea tad; se

" of specia,l ;conductors asillnstrateljn the drawing; I

right of the drum a con ant-.13 is provided whichis ins'u- At theextreme lated cm the drum 'and'; ..extends clear aroundthe-same I haveillustrated in the drawing the insulated material as being interposed"between theend of the drum and thereof, but anyamanner of insulat'i ingthe contactsegment 13 from'the .drum

trated in the drawing, are a number of contactfingers 14, 15, 16' and 17the purposes of which will appear more fully hereinafter.

F or the purpose of rotating the drum, I have provided upon the endthereof a series of ratchet teeth 18 adapted to be en aged and operatedby a ratchet 19 connecte with the core of the solenoid 20. This isarranged to automatically make and break its own circuit, whereby thecore will be alternately raised and lowered.v For effecting thisoperation one terminal of the solenoid is coniiected by the conductor 21with the movable switch 22, the opposite end of which is arrangedtoengage a' contact 23 connected by the conductor 24 with the finger 15.The opposite terminal ofthe solenoid is 'con- 7 nected-by" conductors 25and'26 with the middle wire 28 ofthe supply wires 27, 28 and29. Theupper end of the core 30'of the solenoid 20 is provided wit \njextension 31-upon which are arrangeda pair of adjustable nuts 32 and 33which are .ar-

ranged toengage the switch 2-2' .to operate vthe S21E13; The solenoid 20is alsoprovided dj fi} d -12, h v ill'i'ist atil hpthe nergized longerthan if this paralleled path -diagraniniatic' view ofj-ithe drawing the"YR-I\ --r1ouscontactsas being electrically connected this thetiinepf.deiinergization may be v variedrandthe rapidity ot reciprocationof a solenoid 39 having oneiterminal thereofconnected by the conductor40 through a .mainliand switch 41 with the middle-con- "d-uctor 28 ;.ofthe niain line. The opposite terminal of the solenoid 39 is connected byconductor 42 withthe first conductor 27 of switch '36 is connected byconductor with the third wire 29 of the main line and the contact 6 ofthis switch is connected by the conductor 47 with the third terminal 48of the stator of the motor. One terminal of the switch 37 is connectedby conductor 49 with the middle wire 28 of the main line and the contact50 of said switch is connected by conductor 51 with the middle terminal52 of the stator of the motor. The first terminal 53 of the stator' ofthe motor is connected by conductor 54 with the first wire 27 of themain line.

A relay device comprising a solenoid 55 and a contact member 56 carriedby the core thereof which is arranged to contact with the terminals 57and 58 and 59 and 60, is arranged for controlling the circuit throughthe solenoid 39. One terminal of the solenoid 55 is connected byconductors 42 and 42 with the first wire 27 of the main line and theother terminal thereof is connected 'by conductor'40 and the hand switch41 with the middle wire 28 of the main line. A branch conductor 61 alsoextends from one terminal of the solenoid 55 to the terminal 58 andterminal of the switch controlled'by said solenoid. The terminal 57 ofthis switch is connected byconductor 62 with the contact finger 16 andthe terminal 59 of the switch is connected by conductor 63 with thecontact finger 14.

In operation, assuming that the contact fingers 15 to 17 .are inengagement with the bottom of the contact segment 13, when the inainhand switch 41 is closed the circuit will be closed from the middleconductor of the main line through the conductor 40 through the windingof the solenoid 55 and thence by conductors42f and 42 back to the firstwire 27 of the main line. This energizes the solenoid causing it toraise i core and connect the terminals 57 and 8 by the contact- 56. Thecircuit, is thereupon closed through the winding of the solenoid 20,from'the middle wire 28 of the main line through conductors 26 and 25through the winding of the solenoid by i conductor 21 across the switch22 by conductor 24 to the contact finger 15, across the contact segment13 to the contact finger 16, thence by conductor 62 toterminal 57,across the contact 56 to terminal 58 and by .condu'ctors 61, 42' and 42back to the first wire 27 of the main line. At the same time the circuitis closed by way of conductors 26 and 40 through the windingof thesolenoid 39 by conductor 44 to the contact finger 17 across the contactsegment 13'to the contact finger 16, thence 'by conductor 62 across theterminals 57 and.,.;5 8 by contact 56, and by.

wires 61, 42 and 42 to the first wire 27 of the main line. The solenoid39 is thereby ener ized, closing the switches 36 and; 37 whic controlthe circuit through the stator of th motor.

The solenoid 20 having been energized, will raise its core causing theratchet 19 to engage the teeth 18 on the drum 12 and rotate the drum onestep whereby the first of each of the sets of contacts E), 10'and 11will engage the first finger of each of the sets of finger-5 3, 4 and 5.The motor will now operate with all of the resistance in the rotorcircuit.

As the core 30 of the solenoid 20 is raised, the nut 33 will strike theswitch arm 22 and open the circuit through the solenoid which willpermit its coreto drop. As the core drops, the switch 22 again closes,closing the circuit through the solenoid and the solenoid immediatelyraises its core, turning the drum another step, thereby short circuitingone-section of the resistances 3, 4 and 5, and increasing thevspeed ofthe motor. At the same time the contact finger 17 will .pass off theportion 64 of the contact segment 13 and the circuit through thesolenoid 39 instead of passing by way of contact fingers 16 and 17 willpass throughithe resistance 43, which so reduces the current passingthrough the solenoid that while there is sufiicient current to maintainthe core of the solenoid raised there is not sufficient to raise thecore in event the same is d p ed. The operation of the core of thesolenoid 20 continues to rotate the drum 12, utting out sections of theresistances 3, 4 nd 5 until the last of the contacts 9, 10 reached whenthe motor will be running at fullspeed with the starter in aft 11 onposi- 3 tion. When the last of the con acts 9, 10

and 11 is reached, the contact finger 16 will have passed off thesection 65 of the'con tact segment 13, thereby opening the circuit ofthe reciprocating solenoid 20 and the solenoid will remain at rest. Inevent-now, the main switch 41 is opened to stop the motor, the solenoid39 will be denergized, dropping its core and thereby opening theswitches- 36 and 37 which control the circuit of the stator. of themotor and at the same time the circuit through the solenoid 55 will'be'topened, and its core will drop and open the circuit between theterminals 57 and 58.f

The dropping of the core of the solenoid 55, however, will cause thecontact 56 to engage the contacts 59-and 60 which immediately closes acircuit through the solenoid 20 by way of conductors 26 and 25 throughthe solenoid winding 20, conductor 21, switch 22, conductor 24, contactfinger-15, contact finger 14, conductor 63, across the terminals 59 and"60.by way of conductor contact 66, conductors 61, 42" and 42, back tothe first wire 27 of the main line. The solenoid thus being energizedwill raise its core and move the drum 12 another step and the contactfinger 14 will move off the portion 66 of the contact segment 13,thereby opening the circuit (of the solenoid 20 but moving .the

of the solenoid 39 and the solenoid 55.will

be deenergized to permit its core to drop, but the contact 56 engagingterminals 59 and 60 will maintain the circuit through the solenoid 20and it will continue to rotate the drum until the finger 1 moves off thesection 66'of the segment 13 when the drum will be in starting position.It will therefore be seen that no matter in what position the drum maybe when the motor is stopped,

it will always be moved to starting position before the solenoid 20ceases to operate.

Having described: my invention what I claim as new and desire to secureby Letters Patent is:

1. The combination with a multiphase motor, of resistance in the rotorcircuit thereof, step by step switch .mechanism'for removing saidresistance, electrofmagnetic reciprocating means connected across thesupply circuit for operating said step by step switch mechanism, and arelay connected in-shunt of said electro-magnetic reciprocating meansfor controllin the circuit of said. electro-magnetic reclprocatingmeans.

.2. The combination with a multi base motor, of resistance in the rotorcircuit thereof, step by step switchmechanism for removing saidresistance, electro-magnetic reciprocating means connected across thesupply circuit for operating said step by step switch mechanism, and. arelay con nected' in shunt of said electro-magnetic reciprocating meansand controlling the circuit of said electro-magnetic reciprocating meanssothat said step by step switch mechanism may be returned to itsstarting position whenever the motor is stopped.

3. The combination with a multi hase motor, of resistance in the rotorcircuit thereof,

a rotating drum, contact mechanism operated by the rotation of said drumfor controlling said resistance, electro-magnetic reciprocatingmechanism for operating said drum, an auxiliary contact segment carriedby said drum, and contact members adapted to be engaged by said segmentto control the circuit of said electro magnetic reciprocatng mechanism.

4. The combination with a motor, of a resistance in the circuit thereof,step by step switch mechanism for controlling said resistance, electromagnetic reciprocating means for operating said step by step switch saidelectro-magnetic reciprocating means.

mechanism, a relay, and an auxiliary step by step switch operated bysaid electro-magnetic reciprocating means and cooperating with saidrelay to control the circuit through 5. The combination with amult1phasemotor, of resistance in the 'rotor .circu1t thereof, arotating contact drum for controlling said resistance, electro-magneticreciprocating mechanism for rotating said drum, an auxiliary contactsegment carried by id drum, and contact members arranged to be engagedby said contact segment to control the circuit of said electro-magneticreciprocating mechanism so that said drum may be moved to its initialposition whenever the motor is stopped.

6. The combination with a motor, of re sistance in the circuit thereof,a rotating contact drum for controlling said resistance,electro-magnetic reciprocatin mechanism for rotating said drum, anaunlia contact segment carried by said drum, an contact members adaptedto be engaged by said contact segment to control the circuit ofsaidelectro-magnetic reciprocating mechanism.

7. The combination with a motor, of re: sistance in the circuit thereof,a rotating contact drum for controlling said resistance, electromagnetic reciprocatin mechanism.

members arranged to be engagedrby said contact segment to control thecircuit of said electro-magnetic reciprocating mechanism so that saiddrum may be moved to its initialposition whenever the motor is stopped.

8. The combination with 'a multi basemetor, of resistance in the rotorcircuit thereof, step by step .switch mechanism for removing saidresistance, electro-magnetic recipro' eating mechanism for operatingsaid ste by step switch mechanism, auxiliary switcii' mechanismoperating with said step by step switch mechanism for controlling thecircuit 1 0 of said electro-magnetic reciprocating mechanism, and arelay controlling-the circuit of the stator of said motor, the circuitof said relay being controlled by said auxiliary switch mechanism. 5 1 59. The combination with a multi-phase motor, of resistance therefor, adrum for controlling said resistance, means for operating said drum, anelectromagnetic switch for controllin the stator"circuit of the motor,and "iswitchoperated by said drum for controlling the circuit throughsaid magnet.

10. The combination with a multiphase motor, of resistancein the rotorcircuit thereof,'a rotating contact drum for controlling saidresistances-aperiodically operated electro-magnet for'iotating said drumstep 'by step, an auxiliary contact segment carried by said drum, andcontact members the drum has resistance, election;

' trolling th'e ci r cuitathrough "said magnet,and means for.pe'i'mittin ciprocatingmechanismF- 40 ,l g sii'i'd ;.re si st'ance; ape f fg electr'omagnet for re: tating said drum step by st conerati saidmagnet to operate after themotor as beehstopped, until been moved to itsstarting position.

12. The combination with a mirlti-phase motor, ofrasistance in-the'rotor circuit, a drum for controlling said resistance, a magnetforrotattigg said drum, a relay and a switch opera by said drumcooperatingv to control the circuit through said magnet.

13. The combination with a motor, of a resistance in' the circuitthereof, step by step switch mechanism for controlling said resistance,a solenoid, .a reci rocating core .therefor connected with-sai step bystep switch mechanism and a variable resistance circuit in shunt oisaidsolenoid.

14. The combination with a motor, of a a resistance in the circuitthereof, step by. step switch mechanism for controlling said resistance,electromagnetic reciprocating mechanism for operating said step by stepmechanism, auxiliary switch contacts, and a I common scontact"segiiieiit a sso ciated therev step' s witch mechanism for control--ling t e circuit of said electromagnetic relm combination with a motor,of a resistance in the circuit thereof, step by ste switch mechanism forcontrolling said etic reciprocating mechanism foroperatmg said step bystep switch mechanism, auxiliary circuit changf mechanism operated withthe advance of said step by step mechanism, a relay and a main switchtherefor, said relay and said auxiliary circuitchang'ing mechanismcoacting to control the circuit of said reciprocating electromagneticmechanism.

16. The combination with a motor, ofa resistance in the circuit thereof,step by step switch mechanismcontrolling said re-' sistance,electromagnet reciprocating mechanism for operating said step by stepswitch mechamsm, a relay for controlling the mechanism, a main switchcut out of the circuit, and for maintaining the circuit of saidelectromagnetic reciprocating mechanism when said main switch is openeduntil said step by step switch mechanism has returned to its startingposition.

17. The combination with a motor, of a resistance in the circuit of oneelement thereof, step .by step switch mechanism forcontrfllingsaidresistance, electromagnetic re- Eip'rocating mechanismfor operating said step by step switch mechanism, a relay forcontrolling the circuit of said electromagnetic reciprocating mechanism,a main switch governing said relay, a relay controlling the circuit forthe other element of the motor and governed by said main switch,

and auxiliary circuit changing mechanism operating with the advance ofsaid step by step switch mechanism, for ope] the circuit of saidelectromagnetic reciprocating mechanism when said main switch is closed,after all of said resistance has been cut out of the circuit and for mataining the circuit of said electromagnetic rcciprocating mechanism whensaid-main switch is open until the step by step switch mechanism hasreturned i to its starting position.

- 18. The combination witha motor, of a resistance inthe circuit of oneelement there- .of, step by step switch mechanism for-controlling saidresistance, a solenoid, a core therefor adapted when attracted to breakthe circuit of said solenoid and operatively connectecl with said stepby step switch mechanism, a relay for controlling the circuit of said-solenoid, a main switch governing said relay, auxiliary circuitchanging mechanism for opening the circuit of said solenoid when said.main switch is closed, after all of said resistance has been removedfrom the circuit and for maintaining the circuit of saidsole- 'noid whensaid main switch is open until said step by step switch mechanism hasreturned to its starting position.

19. The combination with a motor,.of a resistance in the circuit of oneelement thereof, step by step switch mechanism for controlling saidresistance, electromagnetic reciprocating mechanism for operating said sep b step switch mechanism, a relay for 'contro ling the circuit of saidelectromagcut-oil relay, and a circuit in shunt of said auxiliaryresistance, said circuit being closed by said. auxiliary circuitchanging mechanism when said main switch is closed, and being openedthereby after said cut'ofi relay. has been actuated.

20. The combination with an alternating current motor, of means forcontrolling the same including a primary circuit-closing device, animpedance for the secondary circuit, an electromagnetic device forgradually removing said impedance by a movement in one direction andconnections established upon stopping of said motor whereby said deviceis efnergizable for continued movement in the same direction to reinsertimpedance preparatory to restarting said motor.

21. The combination with a polyphase motor, of means controlling thesame including a primary circuit-closing device, im pedance for eachphase of the secondary circuit, a controlling member for said impedance,an electromagnetic device for moving said member in the same directionto exclude and reinsert said impedance, a switch controlling saidelectromagnetic device to stop said member in a position to exclude saidimpedance and connections established upon interruption of the rimarcircuit of said-motor to shunt sai switc for continued movement of saidmember to in the same direction to reinsert said resistance preparatoryto. restarting said motor.

23. The combination with an electric motor, of means for establishingpower connections therefor, a variable resistance for inclusion incircuit with said motor, a con: trolling member for said resistance, anelectromagnetic device for movin said member in the same direction toexclu' e and reinsert said resistance, a switch controlli vice to stopsaid'member in a position toexclude said resistance and connectionsestablished upon interruption of the power connections of said motor toshunt said switch for continued movement of said member to reinsert saidresistance.

24. The combination with an electric mopower connections therefor, avariable resistance for inclusion in circuit with said inclusion o theformer'in' the motor circuit,

an electromagnetic device for. moving said member uni-directionally toexclude and reinsert said resistance, means controlling said device tostop said member in a position to exclude said resistance and meansadapted upon interruption of the wer connections of said motor toestablis energizing connections for said device to relnsert saidresistance.

In witness whereof,'I have hereunto sub scribed my name in the presenceof two witnesses.

HENRY H. CUTLER.

Witnesses:

F. R. BAooN, T. E. BARNUM.

said detor, of electro-responsive means to establish I

